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Auto merge of #56813 - oli-obk:main_🧶, r=pnkfelix
Always run rustc in a thread cc @ishitatsuyuki @eddyb r? @pnkfelix [Previously](https://github.com/rust-lang/rust/pull/48575) we moved to only producing threads when absolutely necessary. Even before we opted to only create threads in some cases, which [is unsound](https://github.com/rust-lang/rust/pull/48575#issuecomment-380635967) due to the way we use thread local storage.
1.0.10132
6 years ago by bors
6 years ago in 2 hr 32 min
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Tests
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